David ben Ḥusayn (Ḥasān, Hassūn) Abū Sulaymān was a Karaite scholar in the second half of the tenth century and may have been the son of the Karaite scholar Ḥasan (Ḥusayn) ben Mashiaḥ (Pinsker, 1860). David ben Ḥusayn is also known as Abū al-Ḥusayn David ben Mashiaḥ and is sometimes identified with Abū ʾl-Khayr Dāʾūd ben Mūsaj (Gil 1997, 2004), an esteemed member of the interreligious circle of Neoplatonic philosophers in Baghdad gathered around Abū Sulaymān Muḥammad ibn Ṭāhir al-Sijistānī, known as al-Manṭiqī (the logician, d. 1009).

All of David ben Ḥusayn’s works are lost, but …